If you remove the covering over the wire bundle, you should be able to trace the chewed wire back to its source. Once you have identified which cylinder's coil wire is damaged, you can order a replacement wire for that specific cylinder.
When ordering the wire, you will need to provide the make, model, and year of your vehicle along with the engine size and number of cylinders. You may also need to provide the part number of the wire or the specific location where the wire connects in the wiring harness.
If you are unsure about the specific wire you need, you can try contacting a local auto parts store or the dealership for assistance. They will be able to look up the correct part number based on your vehicle's information.
Replacing a single coil wire is not typically a difficult job and can be done by an amateur with some basic mechanical knowledge and tools. However, if you are not comfortable working on your vehicle's electrical system, it's always best to seek the help of a professional mechanic.